
Screw plug heaters are compact, high-efficiency immersion heaters designed for direct heating of liquids and gases in tanks, vessels, and pipelines. The heating elements are brazed or welded into a threaded plug, allowing easy installation into standard NPT or BSP threaded openings.
These heaters offer rapid heat-up, uniform temperature distribution, and minimal heat loss, making them ideal for applications ranging from water and oil heating to chemical processing. Available in a variety of sheath and plug materials, screw plug heaters can be configured for safe operation in hazardous or corrosive environments.
| Parameter | Value / Range |
| Heating Element Materials | High-grade NiCr and FeCrAl alloy tubular coils |
| Sheath Construction | SS304/316/316L, Incoloy 800/825, Inconel, Copper |
| Plug Materials | Carbon Steel, SS304/316, Brass, Incoloy (zinc plated) |
| Thread Configurations | NPT and BSP threads from ½″ to 4″ |
| Power Range | 0.5 kW to 25 kW (single and three-phase) |
| Voltage Options | 110V, 230V, 415V, 480V (single and three-phase) |
| Watt Density | Up to 100 W/in² (application optimized) |
| Maximum Operating Temperature | 400°C (750°F) continuous operation |
| Element Length Range | 50mm to 3000mm immersion depth |
| Insulation Type | Compacted high-purity MgO powder |
| Terminal Rating | IP65/IP67 weatherproof and explosion-proof options |
| Control Integration | Built-in thermostat, over-temp sensing, dual-element switching |
| Gasket Materials | PTFE, Graphite, Viton (application specific) |
| Certifications Available | ATEX, CIMFR, PESO, IECEx, UL (hazardous area approved) |